LNK604 datasheet(2/18 Pages) POWERINT

2 / 18 page

Rev. F 01/10

LNK603-606/613-616

www.powerint.com

Pin Functional Description

DRAIN (D) Pin:

This pin is the power MOSFET drain connection. It provides

internal operating current for both start-up and steady-state

operation.

BYPASS/MULTI-FUNCTIONAL PROGRAMMABLE

(BP/M) Pin:

This pin has multiple functions:

1. It is the connection point for an external bypass capacitor for

the internally generated 6 V supply.

2. It is a mode selection for the cable drop compensation for

LNK61X series.

FEEDBACK (FB) Pin:

During normal operation, switching of the power MOSFET is

controlled by this pin. This pin senses the AC voltage on the bias

winding. This control input regulates both the output voltage in

CV mode and output current in CC mode based on the flyback

voltage of the bias winding. The internal inductance correction

circuit uses the forward voltage on the bias winding to sense the

bulk capacitor voltage.

SOURCE (S) Pin:

This pin is internally connected to the output MOSFET source for

high voltage power and control circuit common returns.

Figure 2

Functional Block Diagram.

Figure 3.

Pin Configuration.

PI-4908-041508

SOURCE

(S)

LEADING

EDGE

BLANKING

DRAIN

(D)

REGULATOR

6 V

BYPASS

(BP/M)

FEEDBACK

(FB)

SOURCE

(S)

OUT

Reset

6 V

5 V

SAMPLE-OUT

SAMPLE-INPUT

ILIMIT

LIM

ILIMIT

SAMPLE-OUT

SAMPLE-INPUT

ILIMIT

6.5 V

Drive

LIM

MAX

Current Limit

Comparator

STATE

MACHINE

CABLE DROP

COMPENSATION

SAMPLE

DELAY

THERMAL

SHUTDOWN

OSCILLATOR

FAULT

Auto-Restart

Open-Loop

INDUCTANCE

CORRECTION

CONSTANT

CURRENT

D Q

PI-3491-012808

BP/M

P Package (DIP-8C)

G Package (SMD-8C)

D Package (SO-8C)

BP/M

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